JP2002342701A - Device and method for correcting check digit of bar code - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and method for correcting the check digit of a bar code capable of discovering the preparation mistake of a check digit at a host computer side, and correcting a calculation formula capable of preparing an accurate check digit in the host computer. SOLUTION: Whether or not a check digit from a host computer side is appropriate is judged at a bar code printer side, and the judged result is returned to the host computer side. As for print data including a bar code and the transmission check digit of the bar code to be transmitted from the host computer, appropriate check digit calculation is operated at the bar code printer side, and whether or not it is correct is judged, and the judged data are returned to the host computer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for correcting a check digit of a bar code, and more particularly, to a bar code printer which checks whether a check digit calculated by a host computer is correct or not. It relates to a digit correction device and a correction method.

[0002]

2. Description of the Related Art Conventionally, when print data including a bar code is printed, a check digit is calculated for the bar code based on a predetermined calculation formula corresponding to the type, and then a part of the print data is calculated. The bar code data is added to the last part of the bar code data, printed by a bar code printer or the like, and used to confirm whether the bar code has been read properly. The check digit is disclosed in, for example, Japanese Patent No. 2946780.

For example, FIG. 6 shows a general printing system 1.
The printing system 1 is capable of printing bar code data by transmitting and receiving print data 4 between a personal computer or other host computer 2 and a bar code printer 3 connected to the host computer 2. . That is, in the printing system 1, the host computer 2 creates print data 4 and sends it to the barcode printer 3 for printing. The print data 4 is, for example, a type of barcode, JAN1.
In the case of three digits, the actual data 5 (12
Digit), the respective numbers “4, 9,
0,. . . Check digit 6, "4" (one digit) obtained by calculating "7, 0, 7" by a predetermined calculation formula.

The host computer 2 creates print data 4 composed of bar code data (actual data 5) and its check digit 6, and transfers the print data 4 to the bar code printer 3. When created, the print data 4 including the check digit 6 is printed by the barcode printer 3 as it is, causing a malfunction when reading the barcode. In practice, for example, the user of the barcode printer 3 (such as a retail store) prepares the host computer 2 by himself and checks the
There is a problem that an error may occur when the calculation formula is input, and the barcode check digit 6 by the host computer 2 is not properly calculated.

[0005] These problems are caused by the bar code printer 3
Has no effect on the printing operation itself, but not only does the subsequent reading operation of the bar code (print data 4) have an adverse effect, but also because the correction process is not performed, what is the cause of the reading error? There is a problem that it is not obvious.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has an apparatus and a method for correcting a bar code check digit that can detect a check digit creation error on the host computer side. The task is to provide.

It is another object of the present invention to provide a bar code check digit correction device and a correction method which can detect a bar code check digit error and correct it.

It is another object of the present invention to provide a bar code check digit correction device and a correction method capable of avoiding transmission (transfer) of a bar code having an incorrect check digit from a host computer.

Another object of the present invention is to provide a bar code check digit correction device and a correction method capable of creating an accurate bar code check digit on a bar code printer side.

Another object of the present invention is to provide an apparatus and a method for correcting a bar code check digit which can correct a calculation formula capable of creating an accurate check digit in a host computer.

[0011]

That is, the present invention focuses on determining whether or not a check digit from a host computer is appropriate on a barcode printer and returning the determination result to the host computer. According to the first invention, a host computer that generates print data including a barcode, calculates a check digit of the barcode, and outputs the calculated check digit as a transmission check digit, and a barcode printer connected to the host computer. A bar code check digit correction device for transmitting and receiving the print data between the bar code printer and the print data including the bar code transmitted from the host computer and the transmission check digit of the bar code ~ side To determine its correctness, the determination data is a check digit corrective device of the bar code, characterized in that the return to the host computer.

According to a second aspect of the present invention, a host computer that creates print data including a bar code, calculates a check digit of the bar code, and outputs it as a transmission check digit, and a bar code printer connected to the host computer. A bar code check digit correction device for transmitting and receiving the print data, wherein the transmission and reception circuit receives the print data including the bar code transmitted from the host computer, and the bar in the received print data A calculating circuit for calculating a code validity check digit, and a discriminating circuit for discriminating whether or not the transmission check digit of the barcode is correct based on the validity check digit by the calculating circuit, wherein the transmitting / receiving circuit has Discrimination by the discrimination circuit The chromatography data is a check digit corrective device of the bar code, characterized in that to enable back to said host computer.

According to a third aspect of the present invention, a host computer that generates print data including a barcode, calculates a check digit of the barcode, and outputs it as a transmission check digit, and a barcode printer connected to the host computer. A method of correcting a check digit of a bar code when transmitting and receiving the print data, wherein the print data including the bar code transmitted from the host computer and the transmission check digit of the bar code are transmitted by the bar code printer. The bar code check digit correction method is characterized in that the correctness is determined by the above method, and the determination data is returned to the host computer.

An identification circuit for identifying the type of the bar code may be provided.

The bar code printer can return to the host computer that the transmission check digit of the bar code is erroneous, and return the correct appropriate check digit.

The barcode printer can return to the host computer that the transmission check digit is incorrect, together with the type of the barcode.

The barcode printer can return to the host computer barcode data that includes an error in the transmission check digit and a correct correctness check digit.

In the bar code check digit correcting device and the correcting method according to the present invention, the bar code printer determines whether or not the check digit (transmission check digit) from the host computer is appropriate, and the determination result. Is returned to the host computer side, so that the check digit error due to an error in the calculation formula etc. on the host computer side can be detected, the print data based on the bar code having the correct check digit is printed, and the check digit originally By notifying the host computer of the error, the mistake can be corrected and the subsequent data processing can be performed properly.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a bar code check digit correcting apparatus 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5 together with a check digit correcting method. However, the same parts as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 is a block diagram of a bar code check digit correction device 10 in the printing system 1 or the bar code printer 3. The bar code check digit correction device 10 includes a control circuit 11 (CPU), a ROM 12, a RAM 13, , Transmission / reception circuit 14, print control circuit 15, data bus 16
And The control circuit 11 controls the whole via a data bus 16 based on various programs and fixed data stored in the ROM 12, and functions as an identification circuit 17, a calculation circuit 18 or a determination circuit 19. For example, the ROM 12 stores bar code type identification data, a check digit calculation formula based on the bar code type, and the like. The RAM 13 has various work areas, and also has a return data configuration area of the host computer 2.

The transmission / reception circuit 14 communicates with the host computer 2 with the print data 4 including a bar code.
(FIG. 6) and controls transmission and reception of return data from the barcode printer 3.

The print control circuit 15 causes the print section 20 to print the print data 4 from the host computer 2.

The identification circuit 17 in the control circuit 11 stores the print data 4 transmitted from the host computer 2.
Identify the type of barcode within. The calculation circuit 18 calculates the appropriate check digit of the bar code in the received print data 4. The discriminating circuit 19 uses the calculating circuit 1
Based on the appropriate check digit in step 8, the correctness of the bar code transmission check digit is determined.

FIG. 2 is a flow chart showing a procedure of a check digit correction method by the bar code check digit correction device 10 in the bar code printer 3 having such a configuration, and shows a procedure between the host computer 2 and the bar code printer 3. Are both turned on (not shown) and the data link has been established. In step S1, the host computer 2 transfers (transmits) the print data 4 including the barcode and its check digit (transmission check digit) to the barcode printer 3 (transmission / reception circuit 14).

The bar code printer 3 calculates a check digit (proper check digit) of the bar code in the print data 4 received from the host computer 2 and compares it with the received check digit (transmission check digit). It is determined whether the latter is appropriate. That is, the check digit correction device 10 in the bar code printer 3 sets the bar code in the received print data 4 to be, for example, JAN 13-digit print data 4 if the received print data 4 (JAN 13-digit data) is all numbers. It is checked whether it is 13 digits or not, including a check digit (step S2). If there are 13 digits, in step S3, the type is identified, and the check digit is recalculated using the actual data 5 (both shown in FIG. 6) excluding the check digit 6 to obtain a proper check digit. .

Next, in step S4, it is determined whether or not the received transmission check digit matches the recalculated properness check digit (step S4).

If both check digits match, in step S5, printing is performed in the printing unit 20 based on the received data, and the flow returns to step S2.

If "NO" in steps S2 and S4, that is, if it is not 13 digits (step S2) or if the check digit does not match (step S4), the reception is performed without printing. The print data 4 is canceled, and the process proceeds to step S6 where the transmission check digit or the fact that the print data 4 itself has an error is returned to the host computer 2 and the correct check digit is sent to the host computer 2 as discrimination data. Forward.

The host computer 2 receives the report of the check digit error in step S7,
Stop the work and confirm that the return from the barcode printer 3 has been securely received.
(Or, if the transmission / reception is not properly performed, the fact is transmitted). If the operation unit has an error display function, the bar code printer 3 performs an error display and receives the print data 4. Processing is interrupted and printing is stopped (step S8).

Here, the host computer 2 which has received the error data has been notified of the improperness of the check digit or the print data 4 creation program. Correct the nonconformity, start up the barcode printer 3 again, transfer the correct print data 4 and check digit to the barcode printer 3 again, perform a test and confirm, and shift to normal data transmission and reception and printing operation I do.

FIGS. 3, 4 and 5 are explanatory diagrams showing examples of return data or discrimination data from the bar code printer 3 to the host computer 2, respectively. FIG. In this case, after the start code of the return data, an error in the transmission check digit, a correct check digit (proper check digit), and an end code of the return data are returned.

FIG. 4 shows a case where the barcode is not fixed to 13 digits of JAN. There is an error in the transmission check digit following the start code of the return data, and the type of barcode (for example, NW7, JAN13. .), The correct check digit (proper check digit), and the end code of the return data.

FIG. 5 shows a case where the bar code is fixed to 13 digits of JAN, that there is an error in the transmission check digit following the start code of the return data, and that the type of bar code (for example, NW7, JAN13. Etc.), correct bar code data including a correct check digit (proper check digit), and an end code of return data.

In performing the above-mentioned transmission and reception,
Bar code printer 3 including error data return logic
Needless to say, the control software of the host computer 2 and the control software of the host computer 2 according to this agreement are required.

[0034]

As described above, according to the present invention, the check digit of the bar code in the print data from the host computer is recalculated and collated on the bar code printer side, whereby the check digit calculation in the host computer is performed. Since errors are reported as return data, transmission of erroneous barcodes from the host computer to the barcode printer is prevented, barcode printing is accurately performed on the barcode printer, and check digit logic on the host computer is corrected. It can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a bar code check digit correcting apparatus 10 according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a procedure of a check digit correction method by a bar code check digit correction device 10 in the bar code printer 3;

FIG. 3 is an explanatory diagram showing an example of data returned from a barcode printer 3 to a host computer 2;
The case where the barcode is fixed to, for example, 13 digits of JAN is shown.

FIG. 4 is an explanatory diagram showing an example of return data from the barcode printer 3 to the host computer 2;
This shows a case where the barcode is not fixed to 13 digits of JAN.

FIG. 5 is an explanatory diagram showing an example of data returned from the barcode printer 3 to the host computer 2;
The case where the barcode is fixed to 13 digits of JAN is shown.

FIG. 6 is an explanatory diagram of a general printing system 1.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Printing system (FIG. 6) 2 Host computer 3 Barcode printer 4 Print data 5 Actual data 6 Check digit 10 Barcode check digit correction device (embodiment, FIG. 1) 11 Control circuit (CPU) 12 ROM 13 RAM 14 Transmission / reception circuit 15 Print control circuit 16 Data bus 17 Identification circuit 18 Calculation circuit 19 Discrimination circuit 20 Printing section

Claims (7)

[Claims] 1. A printing system comprising: a host computer that generates print data including a bar code, calculates a check digit of the bar code, and outputs the check digit as a transmission check digit; and a bar code printer connected to the host computer. A bar code check digit correction device for transmitting and receiving a bar code, wherein the print data including the bar code transmitted from the host computer and the transmission check digit of the bar code are corrected on the bar code printer side. A bar code check digit correcting device for determining and returning the determined data to the host computer. 2. A method according to claim 1, further comprising the steps of: generating a print data including a bar code, calculating a check digit of the bar code, and outputting the calculated check digit as a transmission check digit, and a bar code printer connected to the host computer. A bar code check digit correction device for transmitting and receiving a bar code, the transmitting and receiving circuit receiving the print data including the bar code transmitted from the host computer, and an appropriate check of the bar code in the received print data Based on the calculation circuit that calculates the digit and the appropriate check digit by this calculation circuit,
A discriminating circuit for discriminating whether the transmission check digit of the bar code is correct or not, wherein the transmitting and receiving circuit is capable of returning discrimination data by the discriminating circuit to the host computer. Check digit correction device. 3. The bar code check digit correcting device according to claim 1, further comprising an identification circuit for identifying a type of the bar code. 4. The barcode printer according to claim 1, wherein the barcode printer returns to the host computer that the transmission check digit of the barcode is erroneous, and returns the correct check digit correctly. Check digit correction device for bar code described in 2. 5. The bar code check digit according to claim 1, wherein the bar code printer returns to the host computer that the transmission check digit is incorrect along with the type of the bar code. Correction device. 6. The bar code printer according to claim 1, wherein said bar code printer returns to said host computer bar code data including said transmission check digit being erroneous and said correct check digit being correct. Barcode check digit correction device. 7. A host computer which generates print data including a bar code, calculates a check digit of the bar code, and outputs it as a transmission check digit, and a bar code printer connected to the host computer. A method for correcting a check digit of a bar code at the time of transmitting and receiving, wherein the print data including the bar code transmitted from the host computer and the transmission check digit of the bar code are corrected on the bar code printer side. Discriminating and returning the discrimination data to the host computer.